Witnesses flooded authorities with calls pleading for help for screaming, bloodied passengers of a derailed children's train ride whose driver was quoted as telling police he was going too fast before the crash that killed a boy.

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The driver of a children's train ride told police he was driving too fast prior to Saturday's accident at a South Carolina park that left a 6-year-old boy dead and sent 18 people to the hospital.

A child captured the fatal accident on video, recording the harrowing moments when the train, carrying 28 people, flew off the tracks.

The video, obtained exclusively by ABC News, was shot by a child on board the "Sparky" ride at Cleveland Park in Spartanburg, S.C., and shows the train speeding up moments before Saturday's accident.

Conrad said he typically "would go slow on the first lap, go a bit faster on the second lap and it was on the third lap around the track when he opened it up to go faster."

"Mr. Conrad said that when he crossed onto the bridge he felt the back end of the engine come off the track and the next thing he knew he was off the rails and into the creek," according to the police report.

There were 28 passengers on the train when it derailed, including children and adults ranging between the ages of 3 to 54, according to police.